Detuned-resonator induced transparency in dielectric-loaded plasmonic waveguides.

We report on the experimental demonstration of detuned-resonator induced transparency in the near-infrared (~800 nm) using two detuned racetrack resonators side-coupled to a bus waveguide. Both resonators and the bus waveguide are in the form of dielectric-loaded surface plasmon polariton waveguides. Leakage radiation microscopy imaging is employed to measure transmission spectra, featuring local maxima at intermediate wavelengths with asymmetrical profiles that are found in good agreement with full-wave numerical simulation results.